The Effect of Local Conditions on Deformation Processes in Low Stacking -Fault Energy FCC Alloys

The nucleation and propagation of deformation twins has been examined in samples of a nitrogen-strengthened austenitic steel alloy deformed at room temperature under quasi-static and high strain rate compression. Post-mortem analysis of the deformed microstructures at different levels of applied strain reveals the nucleation of deformation twins is affected by the grain size distribution of the bulk material. In these materials, deformation twins are nucleated from planar slip bands in the grain interior. The size of these twins is governed by the interplanar spacing between the slip bands. Grain spanning deformation twins evolve from the overlap of these short twin segments; this represents a new model for how twins propagate long distances in grains containing a pre-existing defect structure.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Miller, Bryan D.

Contributors dc:contributor

• Robertson, Ian M.

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI3392219

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82860